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  ~ or more contributor license agreements. See the NOTICE file
  ~ distributed with this work for additional information
  ~ regarding copyright ownership. The ASF licenses this file
  ~ to you under the Apache License, Version 2.0 (the
  ~ "License"); you may not use this file except in compliance
  ~ with the License. You may obtain a copy of the License at
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  ~ http://www.apache.org/licenses/LICENSE-2.0
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<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
  <xs:element name="items" type="ItemsType"/>
  <xs:complexType name="ItemsType">
    <xs:choice minOccurs="0" maxOccurs="unbounded">
      <xs:element name="shirt" type="ProductType"/>
      <xs:element name="hat" type="ProductType"/>
      <xs:element name="umbrella" type="ProductType"/>
    </xs:choice>
  </xs:complexType>
  <!-- Element only content -->
  <xs:complexType name="ProductType">
    <xs:sequence>
      <xs:element name="number" type="xs:integer"/>
      <xs:element name="name" type="xs:string"/>
      <xs:choice minOccurs="0" maxOccurs="unbounded">
        <xs:element name="size" type="SizeType"/>
        <xs:element name="color" type="ColorType"/>
        <xs:element name="description" type="DescriptionType"/>
      </xs:choice>
    </xs:sequence>
    <xs:attribute  name="effDate" type="xs:date"
                    default="1900-01-01"/>
    <xs:anyAttribute namespace="##other" processContents="lax"/>
  </xs:complexType>
  <!-- Simple content -->
  <xs:complexType name="SizeType">
    <xs:simpleContent>
      <xs:extension base="xs:integer">
        <xs:attribute name="system" type="xs:token"/>
      </xs:extension>
    </xs:simpleContent>
  </xs:complexType>
  <!-- Empty content -->
  <xs:complexType name="ColorType">
    <xs:attribute name="value" type="xs:string"/>
  </xs:complexType>
  <!-- Mixed content -->
  <xs:complexType name="DescriptionType" mixed="true">
    <xs:sequence>
      <xs:any namespace="http://www.w3.org/1999/xhtml"
      minOccurs="0" maxOccurs="unbounded"
      processContents="skip"/>
    </xs:sequence>
  </xs:complexType>
</xs:schema>